It was the experience of mystery - even if mixed with fear - that engendered religion.

I do know that kind fate allowed me to find a couple of nice ideas after many years of feverish labor.

We still do not know one thousandth of one percent of what nature has revealed to us.

The only justification for our concepts and systems of concepts is that they serve to represent the complex of our experiences; beyond this they have not legitimacy.

Anyone who thinks science is trying to make human life easier or more pleasant is utterly mistaken.

I have remained a simple fellow who asks nothing of the world; only my youth is gone - the enchanting youth that forever walks on air.

Mere unbelief in a personal God is no philosophy at all.